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  3. W32.Yimfoca.B


Risk Level 1: Very Low

December 3, 2010
December 3, 2010 3:29:26 PM
Also Known As:
W32/Autorun-BQG [Sophos], CXmal/FkFldr-C [Sophos], Troj/Baal-C [Sophos], W32/PushBot-L [Sophos], Troj/Dloadr-DJG [Sophos]
Infection Length:
Systems Affected:
Windows 2000, Windows 7, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows Server 2008, Windows Vista, Windows XP
W32.Yimfoca.B is a worm that attempts to spread through instant messaging applications. It may also download files on to the compromised computer.

Antivirus Protection Dates

  • Initial Rapid Release version December 3, 2010 revision 022
  • Latest Rapid Release version March 27, 2015 revision 007
  • Initial Daily Certified version December 3, 2010 revision 032
  • Latest Daily Certified version March 27, 2015 revision 018
  • Initial Weekly Certified release date December 8, 2010
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Threat Assessment


  • Wild Level: Low
  • Number of Infections: 0 - 49
  • Number of Sites: 0 - 2
  • Geographical Distribution: Low
  • Threat Containment: Easy
  • Removal: Easy


  • Damage Level: Low
  • Payload: Downloads files on to the compromised computer.


  • Distribution Level: Low
  • Ports: TCP 1866
  • Target of Infection: Instant messaging applications.
Note: On May 14, 2015, modifications will be made to the threat write-ups to streamline the content. The Threat Assessment section will no longer be published as this section is no longer relevant to today's threat landscape. The Risk Level will continue to be the main threat risk assessment indicator.
Writeup By: Stephen Doherty

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